http://crypto.stackexchange.com/questions/12688/can-you-explain-bleichenbachers-cca-attack-on-pkcs1-v1-5
https://en.wikipedia.org/wiki/Adaptive_chosen-ciphertext_attack
https://en.wikipedia.org/wiki/Chosen-ciphertext_attack
https://medium.com/@ConsenSys/an-introduction-to-ipfs-9bba4860abd0#.t35gpw41k